Suncook River Lake
Merrimack County, New Hampshire2 acresView mapDirections
No nutrient or algae sampling on record from NHDES for this lake.
- Impaired · Mercury
- Public access
- Limited data
Suncook River Lake in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Surface area: 1.5 acres.
Suncook River Lake is a 2-acre lake in Merrimack County, New Hampshire. Limited fish-species data available. Public access is available with 3 public boat landings.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2021-11-09. Methodology: how these readings are compared.
What Suncook River Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch3 documented ramps
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Suncook River Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Suncook River Lake is safe to swim in today is a call for the New Hampshire Department of Environmental Services and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Suncook River Lake
These are the measurements NHDES publishes for Suncook River Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data.
Ask about Suncook River Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
2 acres
Public access
Yes
Listed by NHDES
No bathymetric survey has been published for Suncook River Lake, so its depth is not documented here.
Recreation & Access
- Ferry StreetPublic
- Public Service of New HampshirePublic
- Exchange Street SitePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
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Stays near Suncook River Lake
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Fishing Suncook River Lake
Reservoir Info (USACE NID)
Suncook River Lake is a man-made reservoir impounded by the China Mill Dam (completed 1860), built primarily for hydroelectric on the Suncook River; concrete-type dam, 29 ft tall and 275 ft long.
- Surface area
- 1.5 ac
- Normal storage
- 22 ac-ft
- Max storage
- 33 ac-ft
- Drainage area
- 259 sq mi
- Hazard class
- High
- Owner
- NH HYDRO ASSOC
Source: USACE National Inventory of Dams, NID ID NH00023 · Operator website · Matched by proximity (0.54 km)
EPA Impairment Status
Suncook River Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHIMP700060802-02 · Official waterbody report
Nearby Lakes in Merrimack County
Frequently asked questions about Suncook River Lake
Where is Suncook River Lake?
- Suncook River Lake is a lake in Merrimack County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Suncook River Lake?
- Suncook River Lake in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Surface area: 1.5 acres.
Is Suncook River Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Suncook River Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Are there boat ramps on Suncook River Lake?
- Suncook River Lake has 3 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Ferry Street, Public Service of New Hampshire, Exchange Street Site. Public access is listed as yes.
Can I fish at Suncook River Lake?
- Suncook River Lake has 3 documented boat landings in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by New Hampshire's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
9 measurements from 1 monitoring station, 2020–2021. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
111133009 samples · 2020–2021
Analytical methods
- Turbidity by Nephelometry
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory